netdev - Re: [PATCH v5 bpf-next 00/11] net: Add support for XDP in egress path

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Date:   Tue, 19 May 2020 10:37:38 -0600
From:   David Ahern <dsahern@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        davem@...emloft.net, kuba@...nel.org,
        prashantbhole.linux@...il.com, brouer@...hat.com,
        john.fastabend@...il.com, ast@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com
Subject: Re: [PATCH v5 bpf-next 00/11] net: Add support for XDP in egress path

On 5/19/20 7:31 AM, Daniel Borkmann wrote:
> I meant that the dev{map,hash} would get extended in a way where the
> __dev_map_update_elem() receives an (ifindex, BPF prog fd) tuple from
> user space and holds the program's ref as long as it is in the map slot.
> Then, upon redirect to the given device in the devmap, we'd execute the
> prog as well in order to also allow for XDP_DROP policy in there. Upon
> map update when we drop the dev from the map slot, we also release the
> reference to the associated BPF prog. What I mean to say wrt 'property
> of the devmap' is that this program is _only_ used in combination with
> redirection to devmap, so given we are not solving all the other egress
> cases for reasons mentioned, it would make sense to tie it logically to
> the devmap which would also make it clear from a user perspective _when_
> the prog is expected to run.

Thanks. I will take a look at this.